/*-
 * Copyright (C) 2010, Romain Tartiere.
 * 
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 * 
 * $Id$
 */

#include "config.h"

#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <nfc/nfc.h>

#include <freefare.h>

uint8_t key_data_picc[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

struct {
    bool interactive;
} format_options = {
    .interactive = true
};

static void
usage(char *progname)
{
    fprintf (stderr, "usage: %s [-y] [-K 11223344AABBCCDD]\n", progname);
    fprintf (stderr, "\nOptions:\n");
    fprintf (stderr, "  -y     Do not ask for confirmation (dangerous)\n");
    fprintf (stderr, "  -K     Provide another PICC key than the default one\n");
}

int
main(int argc, char *argv[])
{
    int ch;
    int error = EXIT_SUCCESS;
    MifareTag *tags = NULL;

    while ((ch = getopt (argc, argv, "hyK:")) != -1) {
	switch (ch) {
	    case 'h':
		usage(argv[0]);
		exit (EXIT_SUCCESS);
		break;
	    case 'y':
		format_options.interactive = false;
		break;
	    case 'K':
		if (strlen(optarg) != 16) {
		    usage(argv[0]);
		    exit (EXIT_FAILURE);
		}
		uint64_t n = strtoull(optarg, NULL, 16);
		int i;
		for (i=7; i>=0; i--) {
		    key_data_picc[i] = (uint8_t) n;
		    n >>= 8;
		}
		break;
	    default:
		usage(argv[0]);
		exit (EXIT_FAILURE);
	}
    }
    // Remaining args, if any, are in argv[optind .. (argc-1)]

    FreefareContext ctx = freefare_init(FREEFARE_FLAG_READER_ALL);
    if (ctx == NULL)
	errx(EXIT_FAILURE, "Unable to init libfreefare");

    tags = freefare_tags_get (ctx, DESFIRE);
    if (!tags) {
	freefare_exit(ctx);
	errx (EXIT_FAILURE, "Error listing Mifare DESFire tags.");
    }

    for (int i = 0; (!error) && tags[i]; i++) {
	if (DESFIRE != freefare_get_tag_type (tags[i]))
	    continue;

	char *tag_uid = freefare_get_tag_uid (tags[i]);
	char buffer[BUFSIZ];

	printf ("Found %s with UID %s. ", freefare_get_tag_friendly_name (tags[i]), tag_uid);
	bool format = true;
	if (format_options.interactive) {
	    printf ("Format [yN] ");
	    fgets (buffer, BUFSIZ, stdin);
	    format = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
	} else {
	    printf ("\n");
	}

	if (format) {
	    int res;

	    res = mifare_desfire_connect (tags[i]);
	    if (res < 0) {
		warnx ("Can't connect to Mifare DESFire target.");
		error = EXIT_FAILURE;
		break;
	    }

	    MifareDESFireKey key_picc = mifare_desfire_des_key_new_with_version (key_data_picc);
	    res = mifare_desfire_authenticate (tags[i], 0, key_picc);
	    if (res < 0) {
		warnx ("Can't authenticate on Mifare DESFire target.");
		error = EXIT_FAILURE;
		break;
	    }
	    mifare_desfire_key_free (key_picc);

	    // Send Mifare DESFire ChangeKeySetting to change the PICC master key settings into :
	    // bit7-bit4 equal to 0000b
	    // bit3 equal to 1b, the configuration of the PICC master key MAY be changeable or frozen
	    // bit2 equal to 1b, CreateApplication and DeleteApplication commands are allowed without PICC master key authentication
	    // bit1 equal to 1b, GetApplicationIDs, and GetKeySettings are allowed without PICC master key authentication
	    // bit0 equal to 1b, PICC masterkey MAY be frozen or changeable
	    res = mifare_desfire_change_key_settings (tags[i],0x0F);
	    if (res < 0)
		errx (EXIT_FAILURE, "ChangeKeySettings failed");
	    res = mifare_desfire_format_picc (tags[i]);
	    if (res < 0) {
		warn ("Can't format PICC.");
		error = EXIT_FAILURE;
		break;
	    }

	    mifare_desfire_disconnect (tags[i]);
	}

	free (tag_uid);
    }

    freefare_free_tags (tags);
    freefare_exit(ctx);
    exit (error);
} /* main() */

